US1378223A - Method for granulating converter-slag - Google Patents

Description

S. R. GARR.

METHOD FOR GRANULATING CONVERTER SLAG. APPLICATION FILED OCT. 18, mm.

78,223. Patented May 17, 1921,

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SAMUEL RICHARD GARE, OF CHULA, IMISSOURI,- ASSIGNOR TO AMERICAN SMELTING- AND REFINING COMPANY, or NEW YORK, N. Y., A CORPORATION or NEW JERSEY.

METHOD FOR GRANULATING CONVERTER-SLAG.

Specification of Letters Patent.

Patented May 17, 1921 Application filed October 18. 1919. Serial No. 331,705.

The invention relates in general to an im-- proved process for disintegrating a falling stream of molten material and specifically relates to an improved process for placing molten converter slag into a condition in which it can be effectively utilized as a flux in the treatment of ores in a reverberatory furnace.

In certain smelting operations, such for instance, as where copper matte is produced, converter slag is sometimes poured in a solid stream into the ore smelting furnace with the intent of utilizing certain elements of the converter slag to aid the fluxing of the ore charge in the reverberatory furnace. Heretofore this method has not proved satisfactory, among other reasons, due to the fact that the stream of molten slag maintained its solidity more or less and while in this condition, the fluxing ingredients present did not mix properly with the ore charge.

Accordingly, one of the objects of the invention is to provide a simple mode of treating the stream of slag so as to open up this stream, or to disintegrate the slag material so as to make the fluxing content available for use in a reverberatory furnace or similar ore treating container.

Broadly, this object is attained by projecting a stream of fluid, such as steam under comparatively high pressure, against the falling stream of molten slag as it is introduced into the furnace and in a direction to cause the slag stream to spread over a material area of the surface of theore charge in the furnace.

Reference is made to the accompanying drawings to show one form of instrumentality, by means of which the method disclosed maybe effectively practised.

In the drawing Figure 1 is a longitudinal, vertical sectional view taken through a reverberatory furnace of conventionalform, equipped with attachments for practising-the new process; and

Figs. 2 and 3 are respectively a plan view anda view in side elevation of the fluid proectmg nozzle shown in Fi 1.

In the drawings, there s shown a reverberatory furnace 10, mounted in a suitable frame-work 11 and having the usual bottom or bed 12, front wall 13 and roof 14 all as is usual in Well known forms of such furnaces. Also following known structures there is outlined diametrically, a slag pot 15 adapted to contain the molten converter slag shown in the act of dumping the slag into the hopper 16. The funnel 17 of the hopper leads through the roof 14 at one end of the furnace and thev stream of molten slag falls vertlcallly into the upper portion of the furnace. echanism is provided for directing a strong blast of fluid against one side of the falling stream just below its entrance into the furnace. This mechanism includes a fish tail nozzle 18 positioned to extend through the front wall 13. The nozzle is in fluid communication with a source of fluid supply, herein indicated diagrammatically by the supply pipe 19. The fluid is preferably steam under relatively high pressure. The discharge end 20 of the nozzle is flat as shown in Fig. 3, is of relatively wide extent as shown in Fig. 2, and is positioned with the flat side disposed horizontally as shown in Fig. 1, so as to cause the projected steam to contact entirely across the slag stream.

The nozzle is so positioned as to direct the fiuid stream in a substantial horizontal direction against the falling stream of molten slag and to act thereon with a force sufficient to open up the stream and spread the forced draft is utilized to introduce other materials into'the furnace,"this forced draft and the material introduced thereby, may be employed to act on, disintegrate and scatter the fiuxstream equally well with the steam herein suggested as the preferred means.

The converter slag when treated as thus outlined granulates and diffuses in the space above the ore bed and is carried along by the draft in this space. This forced draft open- Having thus described my invention, I-

claim Y 1. In the art of granulating converter slag as it is fed to an ore smelting reverberatory furnace, the process which consists in pouring a molten charge of the slag in a stream into the furnace and projecting a stream of steam under relatively high pressure against the falling slag stream to cause a distintegration of the slag and to spread the same over a large portion of the surface of the reverberatory charge in the furnace.

2. In the art of feeding converter slag to a furnace during a metallurgical treatment of ores, the process which consists in pouring a molten charge of the slag in a stream into the furnace "and simultaneously projecting a stream of steam under pressure against the falling slag stream thereby to cause the slag stream to spread out over a large portion of the furnace.

3. In the art of feeding converter slag to a furnace during a metallurgical treatment of ores, the process which consists in pouring a molten charge of the slag in a stream into the furnace and simultaneously projecting a flat, horizontally extending stream of fiu1d under pressure against the falling slag stream thereby to spread the falling slag stream.

4. In the, art of adding a flux to the ore charge in a reverberatory furnace, the process which consists in introducing a molten flux containing substance into the'furnace in the form of a freely falling stream and simultaneously projecting a stream of a fluid.

under pressure into the furnace and in a substantially horizontal direction against said molten substance stream thereby to disintegrate the stream and spread the substance over a relatively large area of the charge in the furnace.

6.'The process which consists in causing a molten stream of converter slag to fall in space, simultaneously projecting a stream of steam under pressure against said falling molten slag and causing the resulting flux to of'hot ores.

7. A reverberatory furnace provided with a material feeding inlet for directing a falling stream of material into the upper portion of the interior of the same, and means for directing a charge of fluid under pressure against a side of said falling stream.

8. A reverberatory furnace having a material feeding inlet for admitting a stream of I vfall in a. diffused condition'onto a-charge falling material to the furnace and a horizontally disposed steam nozzle for directing a jet of steam into contact with said falling stream thereby to spread the same in a direction away from said nozzle.

Signed at Chula, in the county of Livingston, and State of Missouri, this 16th day of September, A. D. 1919.

SAMUEL RICHARD GARR.

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